不同沉淀剂制备CuO-ZnO催化剂甲醛乙炔化反应性能

分别以NaOH、Na₂CO₃、NaHCO₃为沉淀剂，采用共沉淀法制备了Cu：Zn摩尔比为2：1的CuO-ZnO催化剂，利用氢气程序升温还原（H₂-TPR）、热重（TG）、X射线衍射（XRD）及拉曼光谱（Raman）等技术对催化剂进行了表征，结合甲醛乙炔化活性评价，研究了沉淀剂对催化剂结构及催化性能的影响.结果表明，不同沉淀剂对催化剂中活性组分分散度有较大影响，进而在甲醛乙炔化合成1，4-丁炔二醇反应中表现出不同的催化活性.以Na₂CO₃为沉淀剂制备的催化剂中形成CuO-ZnO固溶体，提高了CuO的分散度及Cu⁺在还原性气氛下的稳定性，经活化后可生成较多的活性物种炔化亚铜，表现出最佳的炔化反应活性与1，4-丁炔二醇选择性.

Study on Catalytic Performance of CuO-ZnO Catalyst Prepared by Different Precipitants

CuO-ZnO catalyst with Cu:Zn molar ratio of 2:1 was prepared by coprecipitation method using NaOH, Na₂CO₃ and NaHCO₃ as precipitants. The catalysts were characterized by thermogravimetry (TG), hydrogen-programmed reduction (H₂-TPR), X-ray diffraction (XRD) and Raman spectroscopy (Raman). Combined with the evaluation of formaldehyde acetylation activity, the effect of precipitation agent on the structure and cataly-tic performance of the catalyst were studied. The results show that different precipitants have a great influence on the dispersion of active components in the catalyst, and then show different catalytic activities in the reaction of formaldehyde acetylation to 1,4-butynediol. In the CZ(Na₂CO₃) catalyst, the active species CuO and ZnO form a CuO-ZnO solid solution, which improves the dispersion of CuO and the stability of Cu⁺ under reducing atmosphere. After activation, more active central species acetylene cuprous can be formed. The optimum alkyneization activity is selective with 1,4-butynediol.